Process of coating woven fabrics, paper, and the like.



lUNlTEU ETATEE PATENT mf fflfim OTTO CARL EMIL PAUL WAWRZINIO'K, 0FDRESDEN, GERMANY.

PROCESS OF COATING WOVEN FABRICS, PAPER, AND THE LIKE.

amet.

N0 Drawing.

To all whom, it may concern.

of Germany, residing at Niirnbergerstrasse,

30 Dresden, in the Kingdom of Saxony and German Empire, have invented anImproved Process of Coating Woven Fabrics, Paper, and the like, of whichthe following is a specification.

This invention relates to an improved process of connecting togetherfabrics or sheets of paper or the like by means of adhesive substances,the process being also applicable to the manufacture of artificialleather and for the coating or water-proofing of woven fabrics or paperfor other purposes.

According to this invention the adhesive substances or coatings areapplied to the material not in their final adhesive form but in a formwhich, so far as the final purpose is concerned, may be regarded asnon-adhesive, for example in a dry or slightly plastic condition, thisnon-adhesive coating being subsequently rendered adhesive and made tobind one sheet to the other or to become permanently attached to itsfabric by being moistened with a solvent in the form of steam, gas orspray.

The advantage of the process according to this invention lies in thefact that a considerable saving is effected of solvent and since theprocess can be much more rapidly carried out it necessitates theemployment of less labor. Moreover, the-adhesive or gluing substancesadhere to fibers of the fabrics to be glued together in a far moresatisfactory manner.

The process further enables ingredients to be added to-the adhesivesubstances which could not otherwise be mixed with them were theadhesives used in liquid form, and the coating or adhesive substance canaccording to this invention be put on in a single operation to anydesired thickness which has hitherto been impossible.

While formerly it was necessary to store the adhesive substances in astate of solution, thereby entailing losses from the volatile solventsevaporating, according to this invention the adhesive substances may bestored in a pulverized condition either sepa rately or ready mixed withthe weighting substances if such are used. Alternatively a paste may beformed consisting of dry I Specification of Letters Patent.

Patented June it, il'fililfi.

Application filed July 20, 1909. Serial No. 508,677.

adhesive substances, other dry ingredients such as pulverized cork,pulverized leather or the like, or substances for increasing the weightor for coloring purposes, and a fluid such as oil or water which willform a paste but not dissolve the adhesive substance. The adhesivesubstance is applied to the woven fabric or paper in some well-knownmanner whereupon the fabrics thus treated are according to thisinvention subjected to the action of solvents in the form of steam, gasor spray.

In the manufacture of artificial leather according to this invention theoperation may be described by Way of example as follows:-Nitro-cellulose or celluloid waste is pulverized, mixed with paint indry form, and moistened with castor oil to maintain the substance in acomparatively plastic but still non-adhesive state; in some cases theweight increasing substances such as granulated cork, leather, Wood orsand, are added. The non-adhesive mass thusobtained, which is renderedplastic by the castor oil or some other neutral liquid, is applied tothe surface of the fabric in some well known manner. The coated fabricsare then caused to pass through a closed chamber filled with solvents ina heated condition and in the form of steam, gas or spray, for instance,acetic ether alcohol, acetone, or a mixture of the same. Owing to thehigh temperature of the solvents the coating substance is temporarilydissolved and caused to adhere in a thorough manner to the surface ofthe fabric. The coating substaneeabsorbs only as much of the solvent asit requires for its complete solution, and the layer is not made wetthrough as in the case of processes at present in use. The coated fabricis then introduced into a drying chamber Where the excess of the solventwhich may still remain in the substance is evaporated and recovered inthe known manner.

It will be appreciated that the process is applicable to allindustries'where strips or sheets of woven or other fabric are to bejoined together or to be provided with a waterproof or other coat.

Claims:

1. The process of treating flexible woven fabrics, paper or the like,which consists in applying to the surface of the flexible fabric to becoated adhesive material in powdered form and in a non-active state, inwhich state the adhesive material is capable of being spread over andevenly laid on or removed from said surface, and then subjecting thematerial thus coated to an agent which renders active the'non-activeadhesive material to cause it to firmly adhere to the fabric and formthereon a flexible surface coating, substantially as described.

2. The process of treating flexible woven fabrics, paper or the like,which consists in applying tothe flexible fabric to be coated adhesivematerial in powdered form and moistened by an agent which is inactive todissolve the adhesive, whereby adhesive material applied to the materialto be coated can be spread over or removed from said material, andsubjecting the fabric with the non-active adhesive thereon to the actionof a solvent in gasified form, to cause the ad- 'surface coating on saidhesive to become active and form a pliable fabric.

3. The process of making artificial leather, Which consists in applyingto a strip of fabric, a layer of adhesive material in a plastic butinactive state and consisting of nitrocellulose or its equivalents mixedWith oil paint, and then subjecting the fabric with the layer ofinactive adhesive to the action of a solvent Which renders the adhesiveactive to affix it to the fabric and form thereon a pliable surfacecoating.

In testimony, that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

OTTO CARL EMIL PAUL WAWRZINIOK. Witnesses: i

O'rcro WoLrF, C. J. HUGO DUMMEY.

